Fire-pot construction



Feb. 5, 1929.

O. J. GROEHN FIRE POT CONSTRUCTION Filed May 19, 1923 2 Sheets-Sheet l Otto r1". Graeln Feb. 5, 1929.- 1,701,180

0. J. GROEHN FIRE POT GQNS'I'RUGTION Filed May 19, 1925' 2 Sheets-Sheet 2 Z] mum H301 066.27: Gracfin Patented Feb. 5, 1929.

1,101,1 0 UNITED STATES PATENT OFFICE.

OTTO J'. GROEHN, OF DETROIT, MICHIGAN, ASSIGNOR TO CLAYTON & LAMBERT MFG.

CO., 01 DETROIT, MICHIGAN, A CORPORATION 01 MICHIGAN.

Application filed May 19,

This invention relates to fire pots and refers more particularly to what is known as coil lire pots, that is, in which a preheating coil or the like is mounted on the supply tank and the products of combustion from the burner utilized forheating this coil as well as heating the'tool or other article to be heated. Among the objects of the invention are; to provide an improved manner of mounting the various parts on the tank and in the novel arrangement whereby the parts are readily removable for renewal, repair or any other clesired purpose. One particular objectof the invention is the provision of a shield for the burner and coil which can be formed of-sheet metal stampings or the like and be readily removed without disconnecting the burner and coil from the tank. Other features of the invention reside. in the novel arrangement of the spider or plate which connects the tank with the various parts mounted thereon; in the novel construction of filler plug and in such further features of construction and arrangements and combinations of parts as will more fully hereinafter appear.

In the drawings:

Figure 1 is a side elevational view partly in section through a tank embodying my invention;

Figure 2 is a top plan view of the parts shown in Figure 1, partly broken away;

Figure 3 is a section on the line 3-3 of Figure 1, showing only the shield;

Figure 4 is a detail plan View of the spider which is connected to the top ofthe tank Figure 5 is a section on the line. 5+5 of Figure 4.

Describing now in detail the particular embodiment of my invention shown in the drawings, A designates the tank of the fire pot, which tank is provided with a filler plug A and a pressure pump A the pump being arranged so as to create a pressure in the tank A and through the supply pipe B to the preheating coil O and the burner D whenever the valve B is opened. The burner D is provided with one or more burner apertures D. The tank A is generally provided with suitable hydrocarbon or other liquid fuel which is forced, in the manner above mentioned, through the preheating coil to the burner D where it is ignited and the products of combustion are utilized for heating the tool in the holder E] or other suitable member mounted on the top plate E 1923. Serial No. 640,191.

This top plate E is mounted on the tank in the following manner; upon the upper end of the tankthere is provideda spideror plate F which has three upwardly-offset and out wardly-extending arms F which register with arms E on the plate 1 This spider or plate may be secured to the tank in any suitable manner such as by soldering or welding and preterably 1s sosecured 1n a depress on.

A formed in the upper surface of the tank as shown in Figure 1 of the drawings. Suitable spacer members G and connecting rods G are provided, each of the latter having its opposite ends extending through apertures F and E in the spider and plate respectively so that when the parts are assembled and the nuts G are tightened up on the connecting rods G, the plate E is secured in fixed relation tothe spider F and the tank A. It will be noticed that the spider-shapedplateF, as shown in Figure 4, has a plurality of cut-out portions F and upwardly projecting lug portions F which tend to reduce the heat conducted to i the tank from the burner and its surrounding shield.

Surrounding the burner D and the coil 0 is a shield H comprising an upper frustoconical portion which fits into a groove I in the plate E and a. lower on portion J i which fits over the spider F. T 1e cup portion J has its bottom upwardly offset as at J so as to form a recess J 2 which will fitover the lugs F on the spider F. Thus the cup portion J is provided with a downwardly opening re; cess or cup-shaped ortion which fits over the lugs on the spier F and an upwardly opening recess or cup-shaped portion which receives the lower end of theupper portion of the shield H. This latter-is preferably formed in two or moresections so constructed and arranged that they can be removed without in any way afi'ecting the burner D or the preheating coil C. The latter is connected through suitable piping K and connections K to the tank and in removing the shield H it is not necessary to affect the piping and connections or the burner. a

In detail the upper portion of the shield H is formed in two sections L and L. (See Fig. 3). One side of each of these sections is adapted tofit into a recess M in the edge of the other section and the parts are so constructed and proportioned that when assembledthe two sections L and L will be interlocked and their lower endsreceived tightly within the upwardly-opening recess or cupshaped portion of the cup J while their upper ends are locked in the recess I in the plate E. As is best seen in Fig. 1, the pipe K supplying fuel to the coil C passes through an opening H in the shield H, formed at the juncture of the sections L and L of said shield, thus avoiding interference by said pipe with removal of the hood. After the parts are assembled in this position, the spider l and connecting rods G are inserted in position and the nuts G tightened up so as to lock the parts rigidly in their assembledposition. \Vhen, however, it desired to remove either oi? these sections for the purpose of repair or renewal it is only necessary to uniasten the nuts G and lift the cover plate and connecting rods upwardly which will release the upper end 01 the sections L and L and allow them to be drawn upwardly out of engagement with the cup J and then separated. Moreover, this is accomplished without ai fecting the position of either the burner or the coil and permits replacements to be quickly and conveniently niade. Moreover, by this novel arrangement the top plate is carried by a single connection to the tank which avoids the necessity of soldering or otherwise securing a plurality of uprights to the tank as has been previously done. As theplate E is pro Vided with ears or lugs. N which form the handle connections, the tank containing the liquid fuel is in reality carried by the top plate whenever the the pot is carried by the handle and the connection between the top plate and the tank is through the spider F which is secured to the upper end of the tank as a unit.

The filler plug; A is also formed in a novel manner, this tiller plug having a handle portion 0 and a lower threaded portion Q which is connected to the handle by a shank portion Q which has an outwardlyextending flange E into which is secured the inwardly bent end S of the metal cap T. This construction has an advantage over previous structures in that it is not only rigid but that it can be economically tori'ned and readily attached and detached as a unit.

What I claim as my invention is:

In a. tire pot or the like, a tank, a hurner mounted on the tank, a shield surrounding the burner, said shield comprising a plurality of detachable sections, a spider having face contact with the tank, a. plate a pipe for supplying fuel from said tank to said burner, said pipe projecting through said shield, and clamping means between said spider and plate for holding the sections of the shield in assembled condition therehetween, and means permitting removal of the shield sections upon removal or the plate without disturbing the ren'iaining said elements of the tire pot.

In testimony whereof I atiix my signature.

OTTO J. G tOlGH N. 

